My Suzuki 750 intruder 1991 does'nt start half the times I press the start switch!! When I turn on the ignition, the lights go on as normal, but it does nothing when I press the start switch, till I've pressed it many times and it finally starts. Sometimes it starts right away, but almost never. Any help out there???

I had the same problem on my 800 intruder, it turned out the contacts were bad in the clutch switch. Its an easy fix and easy to check. Disconnect the wires running into the housing for your lights and turn signals and bridge the connection. That will "hotwire" the bike telling it the clutch is pulled in, and try starting it. Chances are thats your problem. A simple $12.00 mostly plastic part... two srews on the under side of the housing will drop the switch out of the clutch assembly, you can take it apart and clean the contacts, but being as your bike like mine has some miles on it. It probably wouldn't hurt to replace it.

Could possibly just be a bad switch, take the switch case apart and verify by using a test light